30 Questions
What property is indicated by a metal's letter designation separated from the alloy designation by a dash?
Hardness
Which type of steel does not accept heat treatment?
Low-carbon steel
What property makes medium-carbon steels especially adaptable for machining or forging?
Ability to accept heat treatment
Which alloying agent acts as a hardener when alloyed with steel?
Silicon
In what applications are high-carbon steels primarily used?
Springs, files, and cutting tools
What characteristic makes Mangalloy unique?
Extreme anti-wear properties
Which property refers to a metal's tendency to return to its original shape after stretching and bending?
Elasticity
What property describes a material's ability to resist tearing or breaking when bent or stretched?
Toughness
When a metal can carry heat or electricity, it is said to have good ____________.
Conductivity
What is the term for the property of a metal to expand when heated and shrink when cooled?
Thermal Expansion
Which property involves a material's ability to absorb heat before conducting or carrying it away?
Conductivity
Metals that can carry heat also carry ____________, making them good electrical conductors.
'Electrons'
What can be added to steel to counteract the negative effects of sulphur?
Manganese
How does phosphorus affect low-carbon steel's resistance to atmospheric corrosion?
Improves resistance
What does nickel contribute to steel during the heat treatment process?
Adds strength and hardness
What effect does manganese have on a metal's forging characteristics?
Makes it less brittle at rolling and forging temperatures
How does adding small amounts of sulphur affect the machinability of steel?
Improves machinability
What undesirable effect does sulphur have on steel when rolled or forged?
Causes brittleness
What is the main characteristic of chromium steel?
Increased wear and corrosion resistance
How does nickel contribute to steel when alloyed with chromium?
Toughens steel
What is the primary purpose of molybdenum in aircraft structural steel?
To reduce grain size and increase impact strength
Why is chrome-moly steel an ideal choice for landing gear structures?
Excellent wear resistance
What type of steel alloy does vanadium produce when combined with chromium?
Strong, tough, and ductile
In what components are ball bearings typically made, according to the text?
Chrome-vanadium steel
What is the primary element responsible for the mechanical properties of steel?
Carbon
What is the main objective of heat treatment in steel?
Change physical and mechanical properties
Why are high-carbon steels particularly suitable for heat treatment?
They respond well to heat treatment
What does the annealing process do to steel?
Softens and relieves internal stress
Which material exceeds commercial use compared to any other material?
Steel
How does heat treatment impact product performance in manufacturing processes?
By increasing strength or other desirable characteristics
Explore the concepts of elasticity and toughness in materials and hardware. Learn about a metal's tendency to return to its original shape (elasticity) and its ability to resist tearing or breaking (toughness) when bent or stretched.
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